CVE-2023-42755 Kernel: rsvp: out-of-bounds read in rsvp_classify()

What is CVE-2023-42755?

CVE-2023-42755 is a medium-severity denial of service vulnerability in Debian Debian Linux, published on 5 Oct 2023. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A flaw was found in the IPv4 Resource Reservation Protocol (RSVP) classifier in the Linux kernel. The xprt pointer may go beyond the linear part of the skb, leading to an out-of-bounds read in the `rsvp_classify` function. This issue may allow a local user to crash the system and cause a denial of service.

Weakness: CWE-125

Which versions are affected by CVE-2023-42755?

It affects 3 products.

Products include Debian Debian Linux, Linux kernel, Redhat Enterprise Linux.

How do I fix CVE-2023-42755?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2023-42755 being exploited?

There is no known exploitation of CVE-2023-42755 in the wild and no public exploit code.

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• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-31269, BELL-CVE-2023-42755, CVE-2023-39195, DEBIAN-CVE-2023-42755, GHSA-qhrq-6m4q-9x2x, OESA-2023-1741 and 1 more.